I wasn't sure about this, so I asked the SARscape developers, one of whom told me: "SARscape *is* able to perform cross interferometry ERS-ASAR, but only as standard interferometry (not stacking and 4 pass, for the moment). And only when the data can be interferometrizable (when they have a particular baseline). Anyway, your trials are correct, because in this case we don't speak of cross interferometry, because the pair are processed separately (Master1 and Slave1 ASAR, Master2 and Slave2 ERS, or vice versa), and this is the only configuration where you can "mix" together different sensors. The problem that I can see is the difference in the wavelength between ASAR and ERS, which can result in a small error in the conversion phase displacement (because we consider one of the two, and not separately). Regarding the multilooking, you cannot set different looks for the two pairs (the same happens for SBAS). So you might want to use as Master1 (in case of SBAS it would be the super Master) the one with lower spatial resolution. Also, the inaccuracy due to using a fixed value of wavelength should not be a big problem, but pay attention to whether the incidence angle is different between the ASAR and ERS pairs (because you were asking about the different number of looks). The only model you can use is the no-model, where only one pair contains a displacement. This is because you cannot mix different incidence angles." I hope this helps. - Peg Exelis VIS